Immersed rapid heat exchange electric core sandwich structure and battery pack

Abstract

The utility model relates to the technical field of electrochemical energy storage, and discloses an immersed rapid heat exchange electric core sandwich structure, which comprises a plurality of flow guide parts for guiding immersion liquid, the plurality of flow guide parts are respectively positioned between adjacent electric cores in corresponding battery modules, the flow guide parts are respectively attached to the surfaces of the electric cores on the two corresponding sides, and the immersion liquid is filled with the immersion liquid. A plurality of through holes used for enabling immersion liquid to flow from one outer side of the battery cell to the other outer side of the battery cell are formed in the flow guide part, one opposite surface of the flow guide part in the length direction is attached to the side surfaces of the battery cells on the two corresponding sides, and the plurality of through holes are formed in the height direction of the flow guide part at intervals and penetrate through one opposite surface of the flow guide part in the width direction; the upper surface of the diversion piece is positioned below the upper surface of the battery cell; the lower surface of the diversion piece is positioned above the lower surface of the battery cell; the utility model can prevent large surface temperature difference of the battery cell and prolong the service life of the battery cell.

Description

Technical Field

[0001] The utility model relates to the technical field of electrochemical energy storage, and in particular to an immersion-type rapid heat exchange battery core sandwich structure and a battery pack. Background Art

[0002] The battery pack includes a box and multiple battery modules located inside the box. Each battery module includes multiple battery cells. Adjacent battery cells are fitted together, and the multiple battery cells in each battery module are connected together by cable ties. During operation of the battery pack, the battery cells in the battery pack will generate a large amount of heat. Currently, the heat is often dissipated by the immersion liquid located in the box.

[0003] Since adjacent battery cells are bonded together, the immersion liquid can only contact the outer surfaces on both sides of the battery cells. The immersion liquid can quickly dissipate heat from the outer surfaces on both sides of the battery cells. The heat in the middle of the battery cell is transferred to the outer surfaces on both sides of the battery cell through heat conduction, which can easily lead to a large temperature difference between the two sides of the battery cell and the temperature of the bonding between adjacent battery cells, which can easily lead to different electrochemical reaction rates in different areas inside the battery cell, thereby easily leading to unstable overall performance of the battery cell, causing the battery cell capacity to gradually decay, and shortening the battery cell service life. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, one of the purposes of the present invention is to provide an immersion-type rapid heat exchange battery core sandwich structure, which can prevent large temperature differences on the surface of the battery core and increase the service life of the battery core.

[0005] The technical solution adopted by the present invention is as follows: an immersion-type rapid heat exchange battery cell sandwich structure, comprising a plurality of guide members for guiding the immersion liquid, wherein the plurality of guide members are respectively located between adjacent battery cells in the corresponding battery module, and the guide members are respectively fitted with the surfaces of the battery cells on the corresponding two sides, and the guide members are provided with a plurality of vias for the immersion liquid to flow from one outer side of the battery cell to the other outer side of the battery cell.

[0006] Explanation: The battery pack includes a box body and multiple groups of battery modules arranged in parallel inside the box body, and each group of battery modules includes multiple battery cells.

[0007] Principle of the technical solution:

[0008] The immersion liquid is located in the box. Since the guide is located between adjacent battery cells and is respectively attached to the surfaces of the battery cells on the corresponding sides, and there are multiple vias on the guide for the flow of immersion liquid, the immersion liquid can directly contact the outer surfaces of both sides of the battery cells. The immersion liquid can indirectly contact the surfaces of the battery cells close to the adjacent battery cells on the same battery module through the vias, thereby dissipating heat for all four surfaces of the battery cells and preventing large temperature differences on the battery cell surfaces.

[0009] Compared with the prior art, the beneficial effects of the present invention are:

[0010] The flow guide member of the present invention and the multiple through holes on the flow guide member can ensure that the immersion liquid flows between adjacent battery cells, dissipate heat for the close surfaces of adjacent battery cells in the same battery module, prevent large temperature differences between the two sides of the battery cells and the joints between adjacent battery cells, and improve the service life of the battery cells; the flow guide member can also resist the expansion force generated during the charging and discharging process of the battery cells, and can avoid direct friction and collision between the battery cells, thereby protecting the integrity of the battery cells and reducing the risk of short circuits.

[0011] As a preferred embodiment of the present invention, one opposite surface of the guide member in the length direction is respectively fitted with the side surfaces of the battery cells on the corresponding two sides, and multiple vias are arranged at intervals along the height direction of the guide member, and the vias pass through one opposite surface of the guide member in the width direction.

[0012] Beneficial effect: It can ensure that the immersion liquid can fully dissipate heat to the opposite sides of adjacent battery cells through the guide member.

[0013] As a preferred embodiment of the present invention, the upper surface of the guide member is located below the upper surface of the battery core, and the lower surface of the guide member is located above the lower surface of the battery core.

[0014] Beneficial effects: Since a bus is provided between the upper surfaces of adjacent battery cells (the bus is respectively connected to the battery poles of adjacent battery cells), the upper surface of the guide is located below the upper surface of the battery cell, that is, a safe distance is reserved between the guide and the bus, thereby preventing short circuit caused by contact between the guide and the bus, and improving the electrical safety of the battery pack; the lower surface of the guide is located above the lower surface of the battery cell, and the space enclosed by the lower surface of the guide, the opposite surfaces of adjacent battery cells, and the bottom plate of the box is used for the flow of immersion liquid to dissipate heat for the battery cell.

[0015] A second object of the present invention is to provide a battery pack comprising the above-mentioned submerged rapid heat exchange battery core sandwich structure.

[0016] As a preferred embodiment of the present invention, it further comprises a plurality of battery cells, and a heat insulating sheet is provided at the lower portion of the battery cells near the outlet of the immersion liquid.

[0017] Beneficial effect: Since the immersion liquid flows out from the bottom plate, the lower surface of the battery cell near the immersion liquid outlet will first come into contact with the immersion liquid, which will make the temperature of the lower surface of the battery cell near the immersion liquid outlet lower, resulting in a large temperature difference between the upper and lower parts of the battery cell. The design of the thermal insulation sheet realizes the isolation of the lower part of the battery cell and the immersion liquid, which can prevent the lower surface temperature of the battery cell from being too low and avoid a large temperature difference between the upper and lower parts of the battery cell.

[0018] As a preferred embodiment of the present invention, the thermal insulation sheet includes a first connecting portion and second connecting portions located at both ends of the first connecting portion, the first connecting portion is in contact with the lower surface of the battery cell, and the two second connecting portions are in contact with the side surfaces in the width direction of the battery cell.

[0019] Beneficial effect: It can cover the bottom of the battery cell and the outer surface of the lower part of the battery cell, and can effectively isolate the lower part of the battery cell from the immersion liquid.

[0020] As a preferred embodiment of the present invention, it also includes a steel belt, an insulating sheet is provided between an opposite surface of the guide member in the length direction and the side surface of the corresponding battery cell, and multiple battery cells and multiple guide members located between adjacent battery cells are connected by the steel belt.

[0021] Beneficial effect: The guide piece is stably connected to the battery cell through the insulating sheet and the steel strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of the utility model's immersion-type rapid heat exchange battery sandwich structure;

[0023] Figure 2 It is a schematic diagram of the structure at position A of the utility model;

[0024] Figure 3 This is a structural schematic diagram of the utility model's immersion-type rapid heat exchange battery sandwich structure from another angle;

[0025] Figure 4 It is a schematic diagram of the structure of a partial battery pack of the utility model;

[0026] Figure 5 This is a schematic diagram of the structure of a partial battery pack of the utility model from another angle;

[0027] Figure 6 It is a structural diagram of the utility model at position B. DETAILED DESCRIPTION

[0028] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially for illustrative purposes and are not intended to limit the present invention.

[0029] In the description of this application, the terms "first", "second", "one side", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the structure referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on this application.

[0030] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] The reference numerals include: flow guide 1 , via 101 , battery cell 2 , thermal insulation sheet 3 , first connection portion 301 , second connection portion 302 , insulating sheet 4 , steel strip 5 , thermal insulation member 6 .

[0032] Example 1

[0033] like Figure 1-3 As shown, the submerged rapid heat exchange battery core sandwich structure includes a plurality of guide members 1 for guiding the immersion liquid, and the plurality of guide members 1 are respectively located between adjacent battery cells 2 in the corresponding battery module, as shown in FIG. Figure 1 As shown, in this embodiment, the guide member 1 can be a plate with a thickness, and the opposite sides of the guide member 1 in the length direction are respectively in contact with the side surfaces of the battery cells 2 on both sides, and the side surface of the guide member 1 in the width direction is provided with a plurality of through holes 101 spaced apart along the height direction of the guide member 1, as shown in FIG. Figure 3 As shown, the via 101 is used for the immersion liquid to flow from one outer side of the battery cell 2 to the other outer side of the battery cell 2. In this embodiment, the upper surface of the guide member 1 is located below the upper surface of the battery cell 2, and the lower surface of the guide member 1 is located above the lower surface of the battery cell 2.

[0034] The battery pack includes the above-mentioned immersion-type rapid heat exchange battery core sandwich structure, and also includes multiple battery cores 2 and steel belts 5. A heat insulation sheet 3 is provided at the lower part of the battery core 2 near the immersion liquid outlet.

[0035] like Figure 4 As shown, in this embodiment, the thermal insulation sheet 3 includes a first connecting portion 301 and second connecting portions 302 located at both ends of the first connecting portion 301. The first connecting portion 301 is bonded to the lower surface of the battery cell 2, and the two second connecting portions 302 are bonded to the side surfaces of the battery cell 2 in the width direction.

[0036] like Figure 5-6 As shown, in this embodiment, an insulating sheet 4 is provided between an opposite surface of the guide member 1 in the length direction and the side surface of the corresponding battery cell 2 , and multiple battery cells 2 and multiple guide members 1 located between adjacent battery cells 2 are connected by a steel belt 5 .

[0037] Example 2

[0038] This embodiment is basically the same as embodiment 1, except that Figure 5 As shown, the battery pack also includes a plurality of thermal insulation members 6, which can isolate the lower part of the battery cell from the immersion liquid. The thermal insulation member 6 includes a first thermal insulation portion and a second thermal insulation portion respectively located at both ends of the first thermal insulation portion. The first thermal insulation portion is located below the corresponding battery module and is bonded to the plurality of battery cells 2 in the battery module. The two second thermal insulation portions are respectively located on both sides of the battery module and are respectively bonded to the corresponding battery cells 2. There is a gap between the side of the guide member 1 in the width direction and the second thermal insulation portion.

[0039] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. An immersion-type rapid heat exchange battery core sandwich structure, characterized by: It includes multiple guide members for guiding immersion liquid, and the multiple guide members are respectively located between adjacent battery cells in the corresponding battery module. The guide members are respectively in contact with the surfaces of the battery cells on both sides. The guide members are provided with multiple vias for the immersion liquid to flow from one outer side of the battery cell to the other outer side of the battery cell.

2. The submerged rapid heat exchange battery core sandwich structure according to claim 1, characterized in that: An opposite surface of the guide member in the length direction is respectively fitted with the side surfaces of the battery cells on both sides, and a plurality of via holes are arranged at intervals along the height direction of the guide member, and the via holes penetrate an opposite surface of the guide member in the width direction.

3. The submerged rapid heat exchange battery core sandwich structure according to claim 1, characterized in that: The upper surface of the flow guide is located below the upper surface of the battery core, and the lower surface of the flow guide is located above the lower surface of the battery core.

4. Battery pack, characterized in that: It comprises the submerged rapid heat exchange battery core sandwich structure described in any one of claims 1-3.

5. The battery pack according to claim 4, wherein: It also includes multiple battery cells, and a heat insulation sheet is provided at the lower part of the battery cells near the immersion liquid outlet.

6. The battery pack according to claim 5, wherein: The thermal insulation sheet includes a first connecting portion and second connecting portions located at both ends of the first connecting portion. The first connecting portion is in contact with the lower surface of the battery cell, and the two second connecting portions are in contact with the side surfaces in the width direction of the battery cell.

7. The battery pack according to claim 4, wherein: It also includes a steel belt, an insulating sheet is provided between an opposite surface of the guide member in the length direction and the side surface of the corresponding battery cell, and multiple battery cells and multiple guide members located between adjacent battery cells are connected by the steel belt.

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